Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2015 Google, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Author: Sami Tolvanen <samitolvanen@google.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #ifndef DM_VERITY_FEC_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #define DM_VERITY_FEC_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "dm-verity.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/rslib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) /* Reed-Solomon(M, N) parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #define DM_VERITY_FEC_RSM		255
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #define DM_VERITY_FEC_MAX_RSN		253
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #define DM_VERITY_FEC_MIN_RSN		231	/* ~10% space overhead */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) /* buffers for deinterleaving and decoding */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define DM_VERITY_FEC_BUF_PREALLOC	1	/* buffers to preallocate */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define DM_VERITY_FEC_BUF_RS_BITS	4	/* 1 << RS blocks per buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) /* we need buffers for at most 1 << block size RS blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define DM_VERITY_FEC_BUF_MAX \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	(1 << (PAGE_SHIFT - DM_VERITY_FEC_BUF_RS_BITS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) /* maximum recursion level for verity_fec_decode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define DM_VERITY_FEC_MAX_RECURSION	4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define DM_VERITY_OPT_FEC_DEV		"use_fec_from_device"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define DM_VERITY_OPT_FEC_BLOCKS	"fec_blocks"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define DM_VERITY_OPT_FEC_START		"fec_start"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define DM_VERITY_OPT_FEC_ROOTS		"fec_roots"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) /* configuration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) struct dm_verity_fec {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct dm_dev *dev;	/* parity data device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct dm_bufio_client *data_bufio;	/* for data dev access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct dm_bufio_client *bufio;		/* for parity data access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	size_t io_size;		/* IO size for roots */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	sector_t start;		/* parity data start in blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	sector_t blocks;	/* number of blocks covered */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	sector_t rounds;	/* number of interleaving rounds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	sector_t hash_blocks;	/* blocks covered after v->hash_start */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	unsigned char roots;	/* number of parity bytes, M-N of RS(M, N) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	unsigned char rsn;	/* N of RS(M, N) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	mempool_t rs_pool;	/* mempool for fio->rs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	mempool_t prealloc_pool;	/* mempool for preallocated buffers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	mempool_t extra_pool;	/* mempool for extra buffers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	mempool_t output_pool;	/* mempool for output */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct kmem_cache *cache;	/* cache for buffers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) /* per-bio data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) struct dm_verity_fec_io {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	struct rs_control *rs;	/* Reed-Solomon state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	int erasures[DM_VERITY_FEC_MAX_RSN];	/* erasures for decode_rs8 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	u8 *bufs[DM_VERITY_FEC_BUF_MAX];	/* bufs for deinterleaving */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	unsigned nbufs;		/* number of buffers allocated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	u8 *output;		/* buffer for corrected output */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	size_t output_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	unsigned level;		/* recursion level */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) #ifdef CONFIG_DM_VERITY_FEC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) /* each feature parameter requires a value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) #define DM_VERITY_OPTS_FEC	8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) extern bool verity_fec_is_enabled(struct dm_verity *v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) extern int verity_fec_decode(struct dm_verity *v, struct dm_verity_io *io,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			     enum verity_block_type type, sector_t block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			     u8 *dest, struct bvec_iter *iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) extern unsigned verity_fec_status_table(struct dm_verity *v, unsigned sz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 					char *result, unsigned maxlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) extern void verity_fec_finish_io(struct dm_verity_io *io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) extern void verity_fec_init_io(struct dm_verity_io *io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) extern bool verity_is_fec_opt_arg(const char *arg_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) extern int verity_fec_parse_opt_args(struct dm_arg_set *as,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 				     struct dm_verity *v, unsigned *argc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 				     const char *arg_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) extern void verity_fec_dtr(struct dm_verity *v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) extern int verity_fec_ctr_alloc(struct dm_verity *v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) extern int verity_fec_ctr(struct dm_verity *v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) #else /* !CONFIG_DM_VERITY_FEC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) #define DM_VERITY_OPTS_FEC	0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) static inline bool verity_fec_is_enabled(struct dm_verity *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static inline int verity_fec_decode(struct dm_verity *v,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 				    struct dm_verity_io *io,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 				    enum verity_block_type type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 				    sector_t block, u8 *dest,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 				    struct bvec_iter *iter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static inline unsigned verity_fec_status_table(struct dm_verity *v,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 					       unsigned sz, char *result,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 					       unsigned maxlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	return sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static inline void verity_fec_finish_io(struct dm_verity_io *io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static inline void verity_fec_init_io(struct dm_verity_io *io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static inline bool verity_is_fec_opt_arg(const char *arg_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static inline int verity_fec_parse_opt_args(struct dm_arg_set *as,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 					    struct dm_verity *v,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 					    unsigned *argc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 					    const char *arg_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static inline void verity_fec_dtr(struct dm_verity *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static inline int verity_fec_ctr_alloc(struct dm_verity *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static inline int verity_fec_ctr(struct dm_verity *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) #endif /* CONFIG_DM_VERITY_FEC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) #endif /* DM_VERITY_FEC_H */